FIBER BRAGG GRATING CRYOGENIC TEMPERATURE SENSORS

Citation
S. Gupta et al., FIBER BRAGG GRATING CRYOGENIC TEMPERATURE SENSORS, Applied optics, 35(25), 1996, pp. 5202-5205
Citations number
20
Categorie Soggetti
Optics
Journal title
ISSN journal
00036935
Volume
35
Issue
25
Year of publication
1996
Pages
5202 - 5205
Database
ISI
SICI code
0003-6935(1996)35:25<5202:FBGCTS>2.0.ZU;2-S
Abstract
Temperature sensing to as low as 80 K was demonstrated with 1.55-mu m fiber Bragg gratings. The gratings were bonded on substrates to increa se sensitivity, and a shift, of the reflection wavelength was measured . The temperature sensitivity was 0.02 nm/K at 100 K when an aluminum substrate was used and 0.04 nm/K at 100 K when a poly(methyl methacryl ate) substrate was used. These values are smaller than those at room t emperature because of the nonlinearity of both the thermal expansion a nd the thermo-optic effect. Extension to the liquid helium temperature is also discussed. (C) 1996 Optical Society of America